I absolutely love the W116 300SD, but the climate control and power windows tend to go bad and make the cars difficult to sell. You can educate yourself on repairing the climate control, and can probably rig it up to work manually. Taking it to the dealer (which is probably the only place that could work on it) would be expensive.

The electric windows almost always go bad, but if they are properly maintained, they can last a long time. The motors themselves never seem to go bad, but lack of lubrication and pressing the switch too long seems to bend and break parts. Also, the vertical aluminum guide rails tend to bend so that the glass doesn't slide up and down well even with the regulator disconnected, and people replace every other part only to have the new parts bend.

I'm the one selling the manual window regulators on eBay, by the way. I can confirm that they are in excellent working condition should you decide to go that route. You're welcome to read my thread on my 300SD that was linked to in a previous post if you want to see more about installing them.

Good luck, whatever you decide to do!

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles